-#ifndef HEADER_OFF_T_H
-#define HEADER_OFF_T_H 1
+#ifndef FILESYS_OFF_T_H
+#define FILESYS_OFF_T_H
#include <stdint.h>
+
+/* An offset within a file.
+ This is a separate header because multiple headers want this
+ definition but not any others. */
typedef int32_t off_t;
-#endif /* off_t.h */
+/* Format specifier for printf(), e.g.:
+ printf ("offset=%"PROTd"\n", offset); */
+#define PROTd PRId32
+
+#endif /* filesys/off_t.h */